Re: [RFC PATCH RT V3] rwsem: The return of multi-reader PI rwsems

[Carsten Emde]

Hi Steven,

> [..] I added Carsten to the Cc, so I'll post the entire change log
> of v1 here again.
I've been listening and testing boxes all the time ...

> [..] If you have any benchmark on large machines I would be very
> happy if you could test this patch against the unpatched version of
> -rt.
Three machines
- an X32 x86_64 (AMD Opteron 6272 @2100 MHz) at rack #1/slot #1,
- an X4x2 x86_64 (Intel i7-2600K @3400 MHz) at rack #4/slot #6, and
- an X4 ARM (i.MX6 Quad @996 MHz) at rack #8/slot #7
are running a v3-patched 3.12.15-rt25 kernel now. I'll equip more
machines later.

What I can say so far is:
- No evidence for any regression, no crashes
- Performance certainly at least as good as unpatched, probably better

I'll do more tests and come back with more precise performance
comparison data.

Thanks,
	-Carsten.
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